According to the ESPN station which I was listening to on SiriusXM, a team scoring 7 goals in the knock off stage of a World Cup is equivalent to the following in other major American sports during POs:

Hockey: A team putting up 14 goals!

Baseball: A team putting up 22 runs!

Football: A team putting up 108 points!

Basketball: A team putting up 480 points

I think that the formula which they used was average goals scored historically per team in the last few World Cups (1.3 goals) and multiplying this German win factor by the averages scored in the other major league games!